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Japan's nuclear crisis

This image made available from Tokyo Electric Power Co. via Kyodo News, shows the damaged No. 4 unit of the Fukushima Dai-ichi nuclear complex in Okumamachi, northeastern Japan, on March 15, 2011. White smoke billows from the No. 3 unit.

Credit: AP Photo/Tokyo Electric Power Co. via Kyodo News

An evacuee is screened for radiation exposure at a testing center, on March 15, 2011, in Koriyama city, Fukushima prefecture, in northern Japan, after a nuclear power plant on the coast of the Fukushima prefecture was damaged by Friday's earthquake.

An extra newspaper with the banner reading, "Radiation Detected in Large Amount," is distributed at Osaka, western Japan, on March 15, 2011. In a nationally televised statement, Prime Minister Naoto Kan said radiation has spread from the three reactors of the Fukushima Dai-ichi nuclear plant in one of the hardest-hit provinces in Friday's 9.0-magnitude earthquake and the ensuing tsunami.

Officials wearing protective suits chat as they usher people through a radiation emergency scanning center in Koriyama city, Fukushima prefecture in northern Japan, March 15, 2011, four days after a giant quake and tsunami struck the country's northeastern coast.

A man walks past a stock price board, March 15, 2011, in Tokyo. Japan's Nikkei stock index nose-dived nearly 11 percent Tuesday as the earthquake-shattered country faced an unfolding nuclear crisis after a radiation leak was detected at a crippled power plant and residents were warned to stay indoors. Other Asian markets also tumbled.

An evacuee is screened for radiation exposure at a testing center, March 15, 2011, in Koriyama city, Fukushima prefecture, in northern Japan, after a nuclear power plant on the coast of the prefecture was damaged by Friday's earthquake.

A radiation detector indicates 0.6 microsieverts, on March 15, 2011, near Shibuya train station in Tokyo, four days after a strong earthquake damaged a nuclear power plant in Fukushima Prefecture, northeastern Japan.

A child is screened for radiation exposure at a testing center,March 15, 2011, in Koriyama city, Fukushima prefecture, in northern Japan, after a nuclear power plant on the coast of the prefecture was damaged by Friday's earthquake.

A pocket radiation detector shows 2.9 micro-sieverts per hour at an evacuation center for people living around the Fukushima Dai-ichi nuclear plant, in Koriyama city, Fukushima prefecture,in northern Japan, on March 15, 2011. Dangerous levels of radiation leaking from the crippled nuclear plant forced the country to order 140,000 people to seal themselves indoors Tuesday after an explosion and a fire dramatically escalated the crisis spawned by Friday's earthquake and subsequent tsunami.

People wait to be screened at a radiation emergency scanning center in Koriyama City, Fukushima prefecture in northern Japan, on March 15, 2011. Radiation leaked from a crippled nuclear plant in tsunami-ravaged northeastern Japan after a third reactor was rocked by an explosion Tuesday and a fourth caught fire in a dramatic escalation of the 4-day-old catastrophe. The government warned anyone nearby to stay indoors to avoid exposure.

Futaba Kosei Hospital patients who might have been exposed to radiation are carried into the compound of Fukushima Gender Equality Centre, in Nihonmatsu, Fukushima prefecture in northern Japan, onMarch 13, 2011, after being evacuated from the hospital near the troubled Fukushima Dai-ichi nuclear power station.

A boy has his radiation level checked at the Fukushima Gender Equality Centre, in Nihonmatsu, Fukushima prefecture in northern Japan, on Sunday, March 13, 2011, after being evacuated from a town located near the troubled Fukushima Dai-ichi nuclear power plant. People who live around the nuclear complex might have been exposed to radiation after an explosion of Unit 1 reactor of the complex blew off the top part of its walls on Saturday, one day after a strong earthquake and tsunami hit Japan's northeast coast.